Weighing-scale.



No. 808,609. PATENTED 13110.26, 1905. P. LEWITZ.

WBIGHING SCALE.

APPLICATION FILED JULY l0.1905

2 SHEETS-SHEET 2.

O9. 5. 5 3g gm W. W

enable others skilled in the art to which it and to the letters ofreference marked there- -vide an electromagnetically-operated weigh--ject involves, among other advantages, the

is an edge view of a small PETER LEWITZ, OF MINNEAPOLIS, MINNESOTA.

WElGHlNG-SCALE.

Specification of Letters Patent.

Patented Dec. 26, 1905.

Application filed July 10, 1905. Serial No. 269,098.

T at whom it may concern:

Be it known that I, PETER Lnwrrz, a citizen of the United States,residing at Minneapolis, in the county of Hennepin and State ofMinnesota, have invented certain new and useful Improvements inWeighing-Scales; and I do declare the following to be a full, clear, andexact description of the invention, such as will appertains to make anduse the same, reference bemg had to the accompanying drawings,

on, which form a part of this specification.

My invention relates to improvements in weighing-scales; and the objectsare, first, to provide a weighing-scale by which bodies or loads ofgreat weight-say all the way from one to one hundred thousand pounds ortons, &c., at a timemay be weighed with the smallest possible number ofweights or poises or other means acting as poises; second, toproing-scale. The first-named object involves a mathematical selectionof the fewest possible numbers from which to produce by combination orplain addition the successive numerals or numbers from 1 to 100,000 oras high as it is desired to go, and the second obavoidance of a serratedor notched scale-beam, with a poise to be moved thereon, which isobjectionable both on account of the wear of the serrations or teeth andthe aptness to make mistakes in using several beams, platforms, slidingpoises, and removable poises, with figures on of different meaning,according to the beam and platform used on the same one scale. These andother objects I attain by the novel construction and arrangement ofparts illustrated in the accompanying drawings, in which- Figure 1 is atop view of a weighing-scale embodying my improvements. Fig. 2 is a sideelevation of such scale with side door to the mechanism-chamber Iomitted. Fig. 3 is an enlarged sectional top View on the line art inFig. 2, showing a portion of a supportingshelf S and magnets mountedthereon and a portion of the keyboard or key system, while the plate His shown only in dotted outline. Fig. I is a top view of one of theweights that may be used as poises for this scale. Fig. 5

and a large weight l of the shape shown in Fig. 4- Fig. 6 is an enlargedportion of the keyboard or box Jd in Fig. 2. Fig.

7 is a left-hand end View of Fig.

6. the slide 0 in Fig. 6.

Referring to the drawings by letters of reference, it should be observedthat all of the numerals 1, 2, 3, 4, 10, 20, 30, 40, 100, 200, 300, 400mean that many pounds and 1M, 2W, 3M, 4M, 10F M, M, and M mean onethousand, two thousand, &c., M standing for the word thousand, saidnumerals all indicating so many pounds to be weighed.

All electric press buttons or keys are marked K K K &c. Poises are P P&c. Poiseholders are H H, &c., and electric batteries are E B, &c., andwhen any of those elements are marked the same number of pounds itindicates that they are used together in weighing such number of poundsexcept as hereinafter explained.

A designates the base or lower frame, and C the platform, of aweighing-scale of somewhat common construction, so that the levermechanism D, rod E, and beam F need no detail description. The beam F issuspended by a bracket Or from the top of the box or chamber I, providedupon the extension A of the base. In this chamber is arranged all themechanism and means by which the beam F is operated, and in front of thechamber is arranged a keyboard J, on which are pivotally mounted at Lthe keys K, by which the weighing is done when electricity is used, asis hereinafter more fully described.

In order to be able to weigh heavy loads with short beams, I arrange inthe large sizes of the scale a second beam F, pivoted at G and connectedby a link N near its fulcrum to the end of the beam F, so that by usingthe lower beam or lever the lifting power transmitted to the platform Ois so greatly multiplied that but comparatively small poises or magnetswill operate the beams. From each beam are pivotally suspended a seriesof rods Q, each provided with an iron plate H H H &c., used as supportsfor weights similar to those in Figs. 4 and 5, or they may act as theloads to be attracted by a series of electric magnets R, fixed uponshelves S S, one below each beam. in holes in the shelves, preferablybetween antifriction-rollers T. (Shown in Fig. 3.)

As it is not practical on' the limited space afforded by patent drawingsto show the relative sizes of magnets, wires, and batteries, nor 'toproperly proportion any of the parts of the scale, it can only be heredescribed that Fig. 8 is a detail top view of a portion of Said rods Q,are guided ILO IIO

the magnets, wires, and the batteries B are of such varietl and relativecapacity as to create magnetic force enough to pull down the plate orplates H, to which the current is directed, antl then lift at theplatform the number of pounds indicated upon such of the keys K as isused to establish connection between the battery and the magnet, dueregard being had to leverage gained by the location of the rotl Q on thebeam or beams used. Some of the batteries operate only one of thepoise-plates H, while others may operate several magnets alternately ortogether, or several batteries are brought to act upon the magnets undera single poise-plate. Such varied connections, as well as the simplestconnection between batteries and magnets, are but partly indicated inFig. 2, while in Fig. 3 is given a fair idea of how the poise-plate Hmay be pulled down by the battery B and weigh either one, two, three, orfour pounds on the platform C by'using, respectively, the magnets R R Rwhich are of the required difl erent power antl will act when receivingcurrent by pressing one of the keys K K K K down so that theircontact-point U touches the plug V and completes a circuit over thewires IV X Y. The intermediate plugs Z are used for convenience ofconnection, but may be dispensed with. The batteries B are preferablyarranged in the lower part of the chamber antl are held steady bystanding in pits provided for them in the base.

In Figs. 6, 7, antl 8 is shown how each key K has a spring-hook b,adaptetl when the key is depressed into contact with V to catch belowthe edge of a flat bar 0, sliding in a suitable guide tZ, .IiXed to thekeyboard. This bar is provided with notches 0, (see Fig. 8,) throughwhich the hooks 0 will raise to their normal position as soon as theslide is in such a position that the spring gets a chance to raise thekey-lever. The slide a is moved longitudinally by having a notch g,engaged by an inclined portion lb, of a vertically-moving stem or slide0', having a push-button j at its top antl at its lower end connectionwith a spring holding the button or key normally elevated. In Fig. 1 canbe seen two such keys 1' and 1', indicating that the weighing-keys maybe arranged in two rows, one for small antl one for extra large weights,operating the upper and lower beams, re spectively, antl may bereleased, one by the key 1' antl the other by the key y".

In the operation or use of the scale if the article or goods on thescale is supposed to weigh from three hundred to four hundred pounds theoperator presses down the button or key marked 300, then key 40, then20, antl so on the keys of the smaller numbers until the scale balances,when he adtls the number of pounds indicated on all the keys presseddown, antl the sum is the weight in pounds of the goods on the scale.hen

the weighing is done, or whenever a key is pressetl down that indicatesmore than the goods on the scale, the key or keys are released bypressing on the button 1' or ,7", so that all other keys are free toassume their normal position, the notches a being presented to the hooks6.

It will be readily seen that by combining the twenty numbers used on thekeys any number from 1 to 100,000 will be obtained. Thus, for example,the numbers 5, 6, 7,.8, and 9 are obtained by using the lower numbers 2ant 3, l and 2 and 3, 3 ant 4, l antl 3 and 4;, 2 ant 3 and 4:,respectively, and in similar mannerthe tens, hundreds, thousands, antltens of thousands are obtained until the one-hundred-thousand limit isreached. For small scales the keys required may be held down by thefingers without using the hooks 7).

here it is convenient to get electricity from a dynamo or other electricwire, the batteries may be dispensed with, and where the electricity isnot desired or available poises or weights similar to those in Figs. aand 5, or any other suitable form, may be used upon the plates H H H&c., and should be marked, respectively, numbers increasing in the ordershown on the keys in Fig. 1.

In Fig. 2, t is a feeler or push-piece by which the operator may feel ifthe scale is nearly balanced and will thus be able to more easily applythe lacking keys K to fully balance it. Combined with said push-piece isan indicator a, which by its position to the pointer 0 shows whether thescale is balanced or not.

Having thus described my invention, what I claim, antl desire to secureby Letters Patent, is-

1. In a weighing-scale, the combination with the scale-beam of a seriesof poise-rods suspended therefrom, iron plates secured on said rods,electromagnets of Various capacities arranged below the plates, electricbatteries of various strengths connected with the magnets, keys insertedin the circuits and marked with numbers representing units of weight inthe following order: 1, 2, 3, 4, 10, 20, 30, 40, 100, 200, 300, 400,1000, 2000, 3000, 4000, 10,000, 20,000, 30,000, 40,000, &c.

2. In a weighing-scale,the combination with the scale-beam of a seriesof poise-rods suspended therefrom, iron plates secured on said rods,electromagnets of various capacities arranged below the plates, electricbatteries of various strengths connected with the magnets, keys insertedin the circuits and marked with numbers representing units of weight.

3. In a weighing-scale, the combination with the scale-beam of a seriesof poise-rods and plates suspended therefrom, iron plates secured onsaid rods, electromagnets of various capacities arranged below theplates, electric batteries of various strengths connected with themagnets, keys inserted in the circuits and I marked with numbersrepresenting units of senting units of weight, said numbers being 5 suchthat when properly combined they will produce all the successive numbersfrom one to the highest number to be weighed on the scale, and automaticmeans for holding said keys down, and means for releasing the de- 20pressed keys, substantially as set forth.

In testimony whereof I afliX my signature in presence of two witnesses.

PETER LEW'ITZ.

Witnesses:

E. H. BoRNHoLz, CHARLES V. WHITE.

